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-rw-r--r--libexec/pppd/sys-str.c643
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diff --git a/libexec/pppd/sys-str.c b/libexec/pppd/sys-str.c
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+/*
+ * sys-str.c - System-dependent procedures for setting up
+ * PPP interfaces on systems which use the STREAMS ppp interface.
+ *
+ * Copyright (c) 1989 Carnegie Mellon University.
+ * All rights reserved.
+ *
+ * Redistribution and use in source and binary forms are permitted
+ * provided that the above copyright notice and this paragraph are
+ * duplicated in all such forms and that any documentation,
+ * advertising materials, and other materials related to such
+ * distribution and use acknowledge that the software was developed
+ * by Carnegie Mellon University. The name of the
+ * University may not be used to endorse or promote products derived
+ * from this software without specific prior written permission.
+ * THIS SOFTWARE IS PROVIDED ``AS IS'' AND WITHOUT ANY EXPRESS OR
+ * IMPLIED WARRANTIES, INCLUDING, WITHOUT LIMITATION, THE IMPLIED
+ * WARRANTIES OF MERCHANTIBILITY AND FITNESS FOR A PARTICULAR PURPOSE.
+ */
+
+/*
+ * TODO:
+ */
+
+#include <stdio.h>
+#include <errno.h>
+#include <syslog.h>
+#include <fcntl.h>
+#include <sys/ioctl.h>
+#include <sys/types.h>
+#include <sys/socket.h>
+#include <sys/time.h>
+#include <sys/stream.h>
+#include <sys/stropts.h>
+
+#include <net/if.h>
+#include <net/route.h>
+#include <net/if_arp.h>
+#include <netinet/in.h>
+
+#include "pppd.h"
+#include "ppp.h"
+#include <net/ppp_str.h>
+
+#ifndef ifr_mtu
+#define ifr_mtu ifr_metric
+#endif
+
+#define MAXMODULES 10 /* max number of module names to save */
+static struct modlist {
+ char modname[FMNAMESZ+1];
+} str_modules[MAXMODULES];
+static int str_module_count = 0;
+
+extern int hungup; /* has the physical layer been disconnected? */
+
+/*
+ * ppp_available - check if this kernel supports PPP.
+ */
+int
+ppp_available()
+{
+ int fd, ret;
+
+ fd = open("/dev/tty", O_RDONLY, 0);
+ if (fd < 0)
+ return 1; /* can't find out - assume we have ppp */
+ ret = ioctl(fd, I_FIND, "pppasync") >= 0;
+ close(fd);
+ return ret;
+}
+
+
+/*
+ * establish_ppp - Turn the serial port into a ppp interface.
+ */
+void
+establish_ppp()
+{
+ /* go through and save the name of all the modules, then pop em */
+ for (;;) {
+ if (ioctl(fd, I_LOOK, str_modules[str_module_count].modname) < 0 ||
+ ioctl(fd, I_POP, 0) < 0)
+ break;
+ MAINDEBUG((LOG_DEBUG, "popped stream module : %s",
+ str_modules[str_module_count].modname));
+ str_module_count++;
+ }
+
+ MAINDEBUG((LOG_INFO, "about to push modules..."));
+
+ /* now push the async/fcs module */
+ if (ioctl(fd, I_PUSH, "pppasync") < 0) {
+ syslog(LOG_ERR, "ioctl(I_PUSH, ppp_async): %m");
+ die(1);
+ }
+ /* finally, push the ppp_if module that actually handles the */
+ /* network interface */
+ if (ioctl(fd, I_PUSH, "pppif") < 0) {
+ syslog(LOG_ERR, "ioctl(I_PUSH, ppp_if): %m");
+ die(1);
+ }
+ if (ioctl(fd, I_SETSIG, S_INPUT) < 0) {
+ syslog(LOG_ERR, "ioctl(I_SETSIG, S_INPUT): %m");
+ die(1);
+ }
+ /* read mode, message non-discard mode */
+ if (ioctl(fd, I_SRDOPT, RMSGN) < 0) {
+ syslog(LOG_ERR, "ioctl(I_SRDOPT, RMSGN): %m");
+ die(1);
+ }
+ /* Flush any waiting messages, or we'll never get SIGPOLL */
+ if (ioctl(fd, I_FLUSH, FLUSHRW) < 0) {
+ syslog(LOG_ERR, "ioctl(I_FLUSH, FLUSHRW): %m");
+ die(1);
+ }
+ /*
+ * Find out which interface we were given.
+ * (ppp_if handles this ioctl)
+ */
+ if (ioctl(fd, SIOCGETU, &ifunit) < 0) {
+ syslog(LOG_ERR, "ioctl(SIOCGETU): %m");
+ die(1);
+ }
+
+ /* if debug, set debug flags in driver */
+ {
+ int flags = debug ? 0x3 : 0;
+ if (ioctl(fd, SIOCSIFDEBUG, &flags) < 0) {
+ syslog(LOG_ERR, "ioctl(SIOCSIFDEBUG): %m");
+ }
+ }
+
+ MAINDEBUG((LOG_INFO, "done pushing modules, ifunit %d", ifunit));
+}
+
+/*
+ * disestablish_ppp - Restore the serial port to normal operation.
+ * It attempts to reconstruct the stream with the previously popped
+ * modules. This shouldn't call die() because it's called from die().
+ */
+void
+disestablish_ppp()
+{
+ /*EMPTY*/
+
+ if (hungup) {
+ /* we can't push or pop modules after the stream has hung up */
+ str_module_count = 0;
+ return;
+ }
+
+ while (ioctl(fd, I_POP, 0) == 0) /* pop any we pushed */
+ ;
+
+ for (; str_module_count > 0; str_module_count--) {
+ if (ioctl(fd, I_PUSH, str_modules[str_module_count-1].modname)) {
+ syslog(LOG_ERR, "str_restore: couldn't push module %s: %m",
+ str_modules[str_module_count-1].modname);
+ } else {
+ MAINDEBUG((LOG_INFO, "str_restore: pushed module %s",
+ str_modules[str_module_count-1].modname));
+ }
+ }
+}
+
+
+/*
+ * output - Output PPP packet.
+ */
+void
+output(unit, p, len)
+ int unit;
+ u_char *p;
+ int len;
+{
+ struct strbuf str;
+
+ if (unit != 0)
+ MAINDEBUG((LOG_WARNING, "output: unit != 0!"));
+
+ str.len = len;
+ str.buf = (caddr_t) p;
+ if(putmsg(fd, NULL, &str, 0) < 0) {
+ syslog(LOG_ERR, "putmsg: %m");
+ die(1);
+ }
+}
+
+
+/*
+ * read_packet - get a PPP packet from the serial device.
+ */
+int
+read_packet(buf)
+ u_char *buf;
+{
+ struct strbuf str;
+ int len, i;
+
+ str.maxlen = MTU+DLLHEADERLEN;
+ str.buf = (caddr_t) buf;
+ i = 0;
+ len = getmsg(fd, NULL, &str, &i);
+ if (len < 0) {
+ if (errno == EAGAIN || errno == EWOULDBLOCK) {
+ return -1;
+ }
+ syslog(LOG_ERR, "getmsg(fd) %m");
+ die(1);
+ }
+ if (len)
+ MAINDEBUG((LOG_DEBUG, "getmsg returned 0x%x",len));
+
+ if (str.len < 0) {
+ MAINDEBUG((LOG_DEBUG, "getmsg short return length %d", str.len));
+ return -1;
+ }
+
+ return str.len;
+}
+
+
+/*
+ * ppp_send_config - configure the transmit characteristics of
+ * the ppp interface.
+ */
+void
+ppp_send_config(unit, mtu, asyncmap, pcomp, accomp)
+ int unit, mtu;
+ u_long asyncmap;
+ int pcomp, accomp;
+{
+ char c;
+ struct ifreq ifr;
+
+ strncpy(ifr.ifr_name, ifname, sizeof (ifr.ifr_name));
+ ifr.ifr_mtu = mtu;
+ if (ioctl(s, SIOCSIFMTU, (caddr_t) &ifr) < 0) {
+ syslog(LOG_ERR, "ioctl(SIOCSIFMTU): %m");
+ quit();
+ }
+
+ if(ioctl(fd, SIOCSIFASYNCMAP, (caddr_t) &asyncmap) < 0) {
+ syslog(LOG_ERR, "ioctl(SIOCSIFASYNCMAP): %m");
+ quit();
+ }
+
+ c = pcomp;
+ if(ioctl(fd, SIOCSIFCOMPPROT, &c) < 0) {
+ syslog(LOG_ERR, "ioctl(SIOCSIFCOMPPROT): %m");
+ quit();
+ }
+
+ c = accomp;
+ if(ioctl(fd, SIOCSIFCOMPAC, &c) < 0) {
+ syslog(LOG_ERR, "ioctl(SIOCSIFCOMPAC): %m");
+ quit();
+ }
+}
+
+/*
+ * ppp_recv_config - configure the receive-side characteristics of
+ * the ppp interface. At present this just sets the MRU.
+ */
+void
+ppp_recv_config(unit, mru, asyncmap, pcomp, accomp)
+ int unit, mru;
+ u_long asyncmap;
+ int pcomp, accomp;
+{
+ char c;
+
+ if (ioctl(fd, SIOCSIFMRU, &mru) < 0) {
+ syslog(LOG_ERR, "ioctl(SIOCSIFMRU): %m");
+ }
+
+#ifdef notyet
+ if(ioctl(fd, SIOCSIFRASYNCMAP, (caddr_t) &asyncmap) < 0) {
+ syslog(LOG_ERR, "ioctl(SIOCSIFRASYNCMAP): %m");
+ }
+
+ c = accomp;
+ if(ioctl(fd, SIOCSIFRCOMPAC, &c) < 0) {
+ syslog(LOG_ERR, "ioctl(SIOCSIFRCOMPAC): %m");
+ quit();
+ }
+#endif /* notyet */
+}
+
+/*
+ * sifvjcomp - config tcp header compression
+ */
+int
+sifvjcomp(u, vjcomp, cidcomp)
+{
+ char x = vjcomp;
+
+ if(ioctl(fd, SIOCSIFVJCOMP, (caddr_t) &x) < 0) {
+ syslog(LOG_ERR, "ioctl(SIOCSIFVJCOMP): %m");
+ return 0;
+ }
+ return 1;
+}
+
+/*
+ * sifup - Config the interface up.
+ */
+int
+sifup(u)
+{
+ struct ifreq ifr;
+
+ strncpy(ifr.ifr_name, ifname, sizeof (ifr.ifr_name));
+ if (ioctl(s, SIOCGIFFLAGS, (caddr_t) &ifr) < 0) {
+ syslog(LOG_ERR, "ioctl (SIOCGIFFLAGS): %m");
+ return 0;
+ }
+ ifr.ifr_flags |= IFF_UP;
+ if (ioctl(s, SIOCSIFFLAGS, (caddr_t) &ifr) < 0) {
+ syslog(LOG_ERR, "ioctl(SIOCSIFFLAGS): %m");
+ return 0;
+ }
+ return 1;
+}
+
+/*
+ * sifdown - Config the interface down.
+ */
+int
+sifdown(u)
+{
+ struct ifreq ifr;
+ strncpy(ifr.ifr_name, ifname, sizeof (ifr.ifr_name));
+ if (ioctl(s, SIOCGIFFLAGS, (caddr_t) &ifr) < 0) {
+ syslog(LOG_ERR, "ioctl (SIOCGIFFLAGS): %m");
+ return 0;
+ }
+ ifr.ifr_flags &= ~IFF_UP;
+ if (ioctl(s, SIOCSIFFLAGS, (caddr_t) &ifr) < 0) {
+ syslog(LOG_ERR, "ioctl(SIOCSIFFLAGS): %m");
+ return 0;
+ }
+ return 1;
+}
+
+/*
+ * SET_SA_FAMILY - initialize a struct sockaddr, setting the sa_family field.
+ */
+#define SET_SA_FAMILY(addr, family) \
+ BZERO((char *) &(addr), sizeof(addr)); \
+ addr.sa_family = (family);
+
+/*
+ * sifaddr - Config the interface IP addresses and netmask.
+ */
+int
+sifaddr(u, o, h, m)
+{
+ int ret;
+ struct ifreq ifr;
+
+ ret = 1;
+ strncpy(ifr.ifr_name, ifname, sizeof (ifr.ifr_name));
+ SET_SA_FAMILY(ifr.ifr_addr, AF_INET);
+ ((struct sockaddr_in *) &ifr.ifr_addr)->sin_addr.s_addr = o;
+ if (ioctl(s, SIOCSIFADDR, (caddr_t) &ifr) < 0) {
+ syslog(LOG_ERR, "ioctl(SIOCSIFADDR): %m");
+ ret = 0;
+ }
+ ((struct sockaddr_in *) &ifr.ifr_dstaddr)->sin_addr.s_addr = h;
+ if (ioctl(s, SIOCSIFDSTADDR, (caddr_t) &ifr) < 0) {
+ syslog(LOG_ERR, "ioctl(SIOCSIFDSTADDR): %m");
+ ret = 0;
+ }
+ if (m != 0) {
+ ((struct sockaddr_in *) &ifr.ifr_addr)->sin_addr.s_addr = m;
+ syslog(LOG_INFO, "Setting interface mask to %s\n", ip_ntoa(m));
+ if (ioctl(s, SIOCSIFNETMASK, (caddr_t) &ifr) < 0) {
+ syslog(LOG_ERR, "ioctl(SIOCSIFNETMASK): %m");
+ ret = 0;
+ }
+ }
+ return ret;
+}
+
+/*
+ * cifaddr - Clear the interface IP addresses, and delete routes
+ * through the interface if possible.
+ */
+int
+cifaddr(u, o, h)
+{
+ struct rtentry rt;
+
+ SET_SA_FAMILY(rt.rt_dst, AF_INET);
+ ((struct sockaddr_in *) &rt.rt_dst)->sin_addr.s_addr = h;
+ SET_SA_FAMILY(rt.rt_gateway, AF_INET);
+ ((struct sockaddr_in *) &rt.rt_gateway)->sin_addr.s_addr = o;
+ rt.rt_flags = RTF_HOST;
+ if (ioctl(s, SIOCDELRT, (caddr_t) &rt) < 0) {
+ syslog(LOG_ERR, "ioctl(SIOCDELRT): %m");
+ return 0;
+ }
+ return 1;
+}
+
+/*
+ * sifdefaultroute - assign a default route through the address given.
+ */
+int
+sifdefaultroute(u, g)
+{
+ struct rtentry rt;
+
+ SET_SA_FAMILY(rt.rt_dst, AF_INET);
+ SET_SA_FAMILY(rt.rt_gateway, AF_INET);
+ ((struct sockaddr_in *) &rt.rt_gateway)->sin_addr.s_addr = g;
+ rt.rt_flags = RTF_GATEWAY;
+ if (ioctl(s, SIOCADDRT, &rt) < 0) {
+ syslog(LOG_ERR, "default route ioctl(SIOCADDRT): %m");
+ return 0;
+ }
+ return 1;
+}
+
+/*
+ * cifdefaultroute - delete a default route through the address given.
+ */
+int
+cifdefaultroute(u, g)
+{
+ struct rtentry rt;
+
+ SET_SA_FAMILY(rt.rt_dst, AF_INET);
+ SET_SA_FAMILY(rt.rt_gateway, AF_INET);
+ ((struct sockaddr_in *) &rt.rt_gateway)->sin_addr.s_addr = g;
+ rt.rt_flags = RTF_GATEWAY;
+ if (ioctl(s, SIOCDELRT, &rt) < 0) {
+ syslog(LOG_ERR, "default route ioctl(SIOCDELRT): %m");
+ return 0;
+ }
+ return 1;
+}
+
+/*
+ * sifproxyarp - Make a proxy ARP entry for the peer.
+ */
+int
+sifproxyarp(unit, hisaddr)
+ int unit;
+ u_long hisaddr;
+{
+ struct arpreq arpreq;
+
+ BZERO(&arpreq, sizeof(arpreq));
+
+ /*
+ * Get the hardware address of an interface on the same subnet
+ * as our local address.
+ */
+ if (!get_ether_addr(hisaddr, &arpreq.arp_ha)) {
+ syslog(LOG_ERR, "Cannot determine ethernet address for proxy ARP");
+ return 0;
+ }
+
+ SET_SA_FAMILY(arpreq.arp_pa, AF_INET);
+ ((struct sockaddr_in *) &arpreq.arp_pa)->sin_addr.s_addr = hisaddr;
+ arpreq.arp_flags = ATF_PERM | ATF_PUBL;
+ if (ioctl(s, SIOCSARP, (caddr_t)&arpreq) < 0) {
+ syslog(LOG_ERR, "ioctl(SIOCSARP): %m");
+ return 0;
+ }
+
+ return 1;
+}
+
+/*
+ * cifproxyarp - Delete the proxy ARP entry for the peer.
+ */
+int
+cifproxyarp(unit, hisaddr)
+ int unit;
+ u_long hisaddr;
+{
+ struct arpreq arpreq;
+
+ BZERO(&arpreq, sizeof(arpreq));
+ SET_SA_FAMILY(arpreq.arp_pa, AF_INET);
+ ((struct sockaddr_in *) &arpreq.arp_pa)->sin_addr.s_addr = hisaddr;
+ if (ioctl(s, SIOCDARP, (caddr_t)&arpreq) < 0) {
+ syslog(LOG_ERR, "ioctl(SIOCDARP): %m");
+ return 0;
+ }
+ return 1;
+}
+
+/*
+ * get_ether_addr - get the hardware address of an interface on the
+ * the same subnet as ipaddr. Code borrowed from myetheraddr.c
+ * in the cslip-2.6 distribution, which is subject to the following
+ * copyright notice:
+ *
+ * Copyright (c) 1990, 1992 The Regents of the University of California.
+ * All rights reserved.
+ *
+ * Redistribution and use in source and binary forms, with or without
+ * modification, are permitted provided that: (1) source code distributions
+ * retain the above copyright notice and this paragraph in its entirety, (2)
+ * distributions including binary code include the above copyright notice and
+ * this paragraph in its entirety in the documentation or other materials
+ * provided with the distribution, and (3) all advertising materials mentioning
+ * features or use of this software display the following acknowledgement:
+ * ``This product includes software developed by the University of California,
+ * Lawrence Berkeley Laboratory and its contributors.'' Neither the name of
+ * the University nor the names of its contributors may be used to endorse
+ * or promote products derived from this software without specific prior
+ * written permission.
+ * THIS SOFTWARE IS PROVIDED ``AS IS'' AND WITHOUT ANY EXPRESS OR IMPLIED
+ * WARRANTIES, INCLUDING, WITHOUT LIMITATION, THE IMPLIED WARRANTIES OF
+ * MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE.
+ */
+
+#include <fcntl.h>
+#include <nlist.h>
+#include <kvm.h>
+#include <arpa/inet.h>
+
+/* XXX SunOS 4.1 defines this and 3.5 doesn't... */
+#ifdef _nlist_h
+#define SUNOS4
+#endif
+
+#ifdef SUNOS4
+#include <netinet/in_var.h>
+#endif
+#include <netinet/if_ether.h>
+
+/* Cast a struct sockaddr to a structaddr_in */
+#define SATOSIN(sa) ((struct sockaddr_in *)(sa))
+
+/* Determine if "bits" is set in "flag" */
+#define ALLSET(flag, bits) (((flag) & (bits)) == (bits))
+
+static struct nlist nl[] = {
+#define N_IFNET 0
+ { "_ifnet" },
+ 0
+};
+
+static void kread();
+
+int
+get_ether_addr(ipaddr, hwaddr)
+ u_long ipaddr;
+ struct sockaddr *hwaddr;
+{
+ register kvm_t *kd;
+ register struct ifnet *ifp;
+ register struct arpcom *ac;
+ struct arpcom arpcom;
+ struct in_addr *inp;
+#ifdef SUNOS4
+ register struct ifaddr *ifa;
+ register struct in_ifaddr *in;
+ union {
+ struct ifaddr ifa;
+ struct in_ifaddr in;
+ } ifaddr;
+#endif
+ u_long addr, mask;
+
+ /* Open kernel memory for reading */
+ kd = kvm_open(0, 0, 0, O_RDONLY, NULL);
+ if (kd == 0) {
+ syslog(LOG_ERR, "kvm_open: %m");
+ return 0;
+ }
+
+ /* Fetch namelist */
+ if (kvm_nlist(kd, nl) != 0) {
+ syslog(LOG_ERR, "kvm_nlist failed");
+ return 0;
+ }
+
+ ac = &arpcom;
+ ifp = &arpcom.ac_if;
+#ifdef SUNOS4
+ ifa = &ifaddr.ifa;
+ in = &ifaddr.in;
+#endif
+
+ if (kvm_read(kd, nl[N_IFNET].n_value, (char *)&addr, sizeof(addr))
+ != sizeof(addr)) {
+ syslog(LOG_ERR, "error reading ifnet addr");
+ return 0;
+ }
+ for ( ; addr; addr = (u_long)ifp->if_next) {
+ if (kvm_read(kd, addr, (char *)ac, sizeof(*ac)) != sizeof(*ac)) {
+ syslog(LOG_ERR, "error reading ifnet");
+ return 0;
+ }
+
+ /* Only look at configured, broadcast interfaces */
+ if (!ALLSET(ifp->if_flags, IFF_UP | IFF_BROADCAST))
+ continue;
+#ifdef SUNOS4
+ /* This probably can't happen... */
+ if (ifp->if_addrlist == 0)
+ continue;
+#endif
+
+ /* Get interface ip address */
+#ifdef SUNOS4
+ if (kvm_read(kd, (u_long)ifp->if_addrlist, (char *)&ifaddr,
+ sizeof(ifaddr)) != sizeof(ifaddr)) {
+ syslog(LOG_ERR, "error reading ifaddr");
+ return 0;
+ }
+ inp = &SATOSIN(&ifa->ifa_addr)->sin_addr;
+#else
+ inp = &SATOSIN(&ifp->if_addr)->sin_addr;
+#endif
+
+ /* Check if this interface on the right subnet */
+#ifdef SUNOS4
+ mask = in->ia_subnetmask;
+#else
+ mask = ifp->if_subnetmask;
+#endif
+ if ((ipaddr & mask) != (inp->s_addr & mask))
+ continue;
+
+ /* Copy out the local ethernet address */
+ hwaddr->sa_family = AF_UNSPEC;
+ BCOPY((caddr_t) &arpcom.ac_enaddr, hwaddr->sa_data,
+ sizeof(arpcom.ac_enaddr));
+ return 1; /* success! */
+ }
+
+ /* couldn't find one */
+ return 0;
+}
generated by cgit v1.2.3 (git 2.25.1) at 2025-08-07 01:41:36 +0000